In the classification of the World Health Organization from 1973, borderline tumors were classified as a separate group of epithelial ovarian tumors. The most important characteristics of such tumors include: the absence of destructive stromal invasion and a buildup of epithelial cells as well as moderate mitotic activity and nuclear atypia. Surgery, which can be fertility-sparing in younger women who plan pregnancy, is the basic treatment of borderline tumors. Adjuvant therapy is, however, a debatable issue. In selected cases, chemotherapy is implemented but treatment protocols are not uniform and vary in different centers. The indications for adjuvant treatment and the number of cycles are determined by the experience of an oncological center. Doubts usually concern patients with invasive implants and advanced forms of the disease. The aim of the paper was to present a rather special case of a 25-year-old patient with bilateral borderline ovarian tumors with invasive implants in the peritoneum and greater omentum. The patient underwent a sparing surgery, due to her decision to retain fertility, followed by chemotherapy. The patient has not presented any signs of relapse for two years. The article also presents a review of available literature on adjuvant treatment of borderline tumors and new recommendations of experts and oncological societies. Most of the studies indicate that systemic treatment is ineffective. In the case presented, however, a remission was achieved after six cycles of chemotherapy, which suggests the need for individualizing treatment in certain cases.